数字农科院2.0

Heatwaves increase the polystyrene nanoplastic-induced toxicity to marine diatoms through interfacial interaction regulation

文献类型： 外文期刊

作者： Xuan Hou; Xiangang Hu; Li Mu; Yuanyuan Wei

关键词： Nanoplastics; Diatoms; Heatwaves; Photosynthesis; Carbon fixation

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2024 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Marine heatwaves, prolonged high-temperature extreme events in the ocean, have increased worldwide in recent decades. Plastic pollution is widespread in the ocean, and the continuous weathering of plastics leads to a substantial release of nanoplastics (NPs). However, the interactive impacts and in-depth mechanisms of heatwaves and NPs on diatoms are largely unknown. Here, we show that a heatwave intensity of 4 ◦C amplified the toxicity of polystyrene NPs to the globally important diatom Chaetoceros gracilis (C. gracilis), with reductions of 5.62 % and 9.46 % in growth rate and photosynthesis, respectively. Notably, NPs significantly inhibited the cellspecific C assimilation rate by 18.28 % under heatwave conditions. The enhanced NP-induced toxicity to C. gracilis was attributed to decreased mechanical strength and increased NP adsorption under heatwave conditions, which increased membrane damage and oxidative stress. Transcriptomic analysis demonstrated that NPs disturbed redox homeostasis and caused mechanical stress to C. gracilis under heatwave conditions. Moreover, NP treatment downregulated genes (psbA and rbcL) encoding photosynthesis core proteins and the pivotal carbon-fixing enzyme RubisCo under heatwave conditions, resulting in decreased growth and C fixation rates.

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